Forum Discussion

Nimbostratus

Jun 10, 2014

Need to access server IP in CLIENT_DATA

I need to make a modification to the TCP::payload with the target IP of the back-end server. I'm able to make the modifications (when there's one known target server) but I need to do this with a clu...

Employee

Jun 10, 2014

have you tried TCP::collect in LB_SELECTED?

How to process Client side's TCP Payload after SERVER_CONNECTED?

https://devcentral.f5.com/questions/how-to-process-client-sides-tcp-payload-after-server_connected

R_Marc

Nimbostratus

Jun 10, 2014

Yes. Perhaps I'm doing something wrong there, but here's what I tried as a test:

    when CLIENT_ACCEPTED {
  log local0. "client ip [IP::client_addr]"
}
when CLIENT_DATA {
  log local0. "in client data"
}
when LB_SELECTED {
    TCP::collect
    log local0. "[TCP::payload]"
    TCP::release

}

when SERVER_CONNECTED {
      log local0. "[IP::server_addr]"
}

Here's what I see in the log:

Jun 10 12:05:53 slot1/bip info tmm[10558]: Rule /Common/monitoring-rule : client ip 10.0.148.33
Jun 10 12:05:53 slot1/bip info tmm[10558]: Rule /Common/monitoring-rule :
Jun 10 12:05:53 slot1/bip info tmm[10558]: Rule /Common/monitoring-rule : 10.0.145.161

I'll read that article though and see if I find anything useful.

nitass
Employee
Jun 10, 2014
i think you should release data (TCP::release) in CLIENT_DATA (not LB_SELECTED).
R_Marc
Nimbostratus
Jun 10, 2014
Got it working... Thanks for the tip.